JP3480511B2 - Press machine stop control device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press machine control device, and more particularly to a press machine stop control device suitable for stopping a slide at a top dead center.

[0002]

2. Description of the Related Art Conventionally, when a slide of a press machine is stopped at a top dead center, the rotational position of the drive shaft is set to a predetermined position before the top dead center in consideration of the rotation (slip) of the drive shaft due to inertia. A drive stop signal is output when the drive comes to the position (for example, Japanese Patent Publication No. 64-40793 and Japanese Patent Publication No. 59-12400). In addition, Japanese Examined Japanese Patent Sho 60-816
Japanese Unexamined Patent Publication No. 0 discloses a technique of detecting a rotation period and a rotation position of a drive shaft, inputting a stop signal sending angle from a keyboard, and calculating a top dead center stop signal sending angle by a computer.

[0003]

However, in the press machine, even if the press speed is set to the same value,
The slip amount of the drive shaft varies depending on the operation mode such as the stroke operation mode or the continuous operation mode, and it is difficult to accurately stop the slide at the top dead center by the above-described stop devices or stop methods. In addition, immediately after the press machine starts operating and when it is operating continuously for a long time,
Due to changes in various conditions such as the temperature of the machine and the coefficient of friction of the brake, the amount of slip changes, making it difficult to always stop the slide at the top dead center.

Furthermore, in the stopping method disclosed in Japanese Patent Publication No. 60-8160, the angle at which the stop signal is output is calculated from the rotation cycle of the press. When the press is stopped within the rotation, the clutch is in the process of engaging and the accurate rotation cycle cannot be obtained, thus lowering the top dead center stop accuracy. Moreover, even if the rotation cycle is calculated, the stop position deviates from the top dead center because the rotation speed of the drive shaft differs between the time when the rotation cycle is obtained and the time when the drive stop signal is actually output. Also, in conventional press machines, if an abnormality occurs in the top dead center stop control circuit system such as a memory that stores the reference rotational position for outputting a stop signal, the drive shaft overruns and slides. Without stopping at top dead center
It is extremely dangerous.

The present invention has been made to solve the above-mentioned drawbacks of the prior art, and enables the slide to be accurately stopped at the top dead center even when the operation mode of the press is different. The purpose is to do. Also,
An object of the present invention is to enable the slide to be accurately stopped at the top dead center even when the state of the machine changes during the operation of the press.
A further object of the present invention is to prevent slide overrun even when an abnormality occurs in the top dead center control circuit system.

[0006]

In order to achieve the above object, a first stop control device for a press machine according to the present invention is provided.
Is at least for each operation mode in which the slide travels one stroke.
In response to, against the press speed, the slip data storage means for storing in advance obtains the difference between the stop position of the actual driving shaft and the driving stop signal output position, rotation angle detecting means for obtaining a rotation angle of the drive shaft A rotation speed of the drive shaft, rotation angle detection means for obtaining a rotation angle of the drive shaft, and
A press speed detecting means for obtaining a rotation speed , a mode signal outputting means for outputting an operation mode of a selected press, an output signal of the mode signal outputting means and the press speed detecting means are fetched and stored in the slip data storing means. While determining the drive stop signal output position of the press based on the stored slip data, based on the detection signal of the rotation angle detection means, the drive shaft , when the drive stop signal output position is determined, A drive stop signal output means for outputting a drive stop signal to a drive control section for controlling the drive of the press;
It is configured to have.

A second aspect of the present invention is based on the first aspect of the present invention and is based on the output signals of the drive stop signal output means, the rotation angle detection means, the press speed detection means and the mode signal output means. A structure is provided in which slip correction means is provided for finding the actual slip amount and rewriting the slip data in the slip data storage means to the newly obtained slip amount.

Furthermore, a third aspect of the present invention is the same as the second aspect.
The lower limit value that is predetermined according to the press speed and that the drive stop signal output means should not output the drive stop signal to the rotational position where the drive shaft reaches, and the drive stop signal output means that the drive stop signal output means reaches the rotational position where the drive shaft reaches The drive stop signal output means outputs the drive stop signal output means from the upper and lower limit value storage means storing the upper limit values to which the drive stop signal should be output, and the upper and lower limit values in the upper and lower limit value storage means and the output signal of the press speed detection means. The lower limit value that should not output the drive stop signal and the upper limit value that should output the drive stop signal are determined, and the drive stop is determined from the output signals of the rotation angle detection means and the drive stop signal output means. signal output means, when the drive shaft has output the drive stop signal before reaching the lower limit, or the driving stop signal outputting means, the time in which the drive shaft has reached the upper limit value If you do not output the serial driving stop signal, and has a structure in which an emergency stop signal output means for outputting the emergency stop signal to the drive controller.

Two drive stop signal output means and two emergency stop signal output means are provided, and each of them has a dual circuit structure in which predetermined processing is independently performed in parallel to further enhance safety. Can be

[0010]

In the first aspect of the present invention configured as described above, the relationship between the press speed and the output position of the drive stop signal is previously obtained and detected in advance corresponding to the operation mode such as one-stroke operation and continuous operation. The drive stop signal is output when the rotational position of the drive shaft reaches the drive stop signal output position obtained in advance, so that the slide can be accurately moved to the top dead center even when the operation mode is different. Can be stopped.

Further, according to the second aspect of the present invention, the slip data stored in the slip data storage means is rewritten to obtain the actual slip amount, so that when the press is continuously operated for a long time. The slide can be accurately stopped at the top dead center even when various conditions such as the temperature and lubrication of the machine and the friction coefficient of the brake are changed. And in the 3rd of this invention,
Even if there is a case where the drive stop signal is not output at the predetermined rotation position of the drive shaft due to an abnormality in the control circuit system at the top dead center, it is urgent based on the upper and lower limit values preset according to the press speed. Since a stop signal is output, slide overrun can be prevented, and danger can be prevented.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a stop control device for a press machine according to the present invention will be described in detail with reference to the accompanying drawings. Figure 1
FIG. 3 is a block diagram of a stop control device according to a first embodiment of the present invention, in which a so-called double circuit including two control systems having the same structure is formed to enhance safety.

In FIG. 1, the CPUs 10a and 10b are
Each of them plays a role of a drive stop signal output means and an emergency stop signal output means, and receives a press speed signal from a press speed detection means (not shown) and drives a drive shaft (not shown) detected by a rotation angle detection means (not shown). The rotation angle signal is input. Further, various operation interlock signals are input to the CPUs 10a and 10b, and an operation mode signal is input from an operation mode selection switch (not shown) which is a mode signal output means provided in the press body. Then, as will be described later, each of the CPUs 10a and 10b has a clutch / brake control valve (C / B) as a drive control unit that controls the clutch / brake 12 that transmits and disconnects the power of a main motor (not shown) to the drive shaft. Valve) 1
A drive stop signal is output to 4 and 15.

The rotation angle detecting means (not shown) can be composed of, for example, a pulse generator provided on the drive shaft and an angle calculator for taking in the pulses generated by the pulse generator and converting them into angle signals. Further, the press speed detecting means (not shown) takes in the pulse generator and the pulse output from the pulse generator to calculate the rotation speed of the drive shaft, and slides up and down by the rotation of the drive shaft (not shown). No.) can be configured by a speed calculator that calculates the vertical speed.

Each of the CPUs 10a and 10b has a control ROM 16 storing a control program and the like via a bus.
a, 16b, RAMs 18a, 18b for writing input data and control programs, etc., and a DPRAM 20 for writing a reference drive stop signal output position as described later.
a and 20b are connected. Further, the DPRAM 20a and the DPRAM 20b are connected to each other via a bus, and also correspond to the ROM 22 as an upper and lower limit value storage means for storing the data of upper and lower limit values described later via the bus, and the operation mode of the press machine. E constituting a slip data storage means for storing the data of the drive stop signal output position
An EPROM 24 and a CPU 26 for reading data stored in the ROMs 22 and 24 and writing to the DPRAMs 20a and 20b are connected.

The data stored in the EEPROM 24 is the top dead center stop slip angle (slip data) as shown in FIG. 2, that is, the rotational position (rotation angle) of the drive shaft and the drive when the drive stop signal is output. The difference from the position (angle) at which the rotation of the shaft actually stops is stored. These slip angles are obtained in advance in relation to the press speed in the operation mode of the press (for example, the speed at the bottom dead center of the slide). For example, when the curve A is in the one-stroke operation mode, the slip angle at the top dead center is stopped. , Curve B is the data of the top dead center stop slip angle in the continuous operation mode of the press. Further, the data of the upper and lower limit values stored in the ROM 22 are represented by the lower limit slip angle and the upper limit slip angle as shown by the solid line in FIG. 3, and are shown between the lower limit slip angle and the upper limit slip angle. It is set so as to include the slip data of the curves A and B shown in FIG. In addition, ROM22, E
The data stored in the EPROM 24 is not the slip angle itself as described above, but may be the rotation angle data of the drive shaft for outputting the drive stop signal to stop the slide at the top dead center in consideration of the slip angle. Good.

The operation of the embodiment constructed as described above is as follows. The EEPROM 24 stores a slip angle (top dead center stop data) previously obtained corresponding to the press speed for each operation mode, as shown in FIG.
The ROM 22 stores the upper limit slip angle and the lower limit slip angle shown by the solid line in FIG. Then, when the power is turned on and the control device is activated, the CPU 26 causes the EE
The data in the PROM 24 is sum-checked to determine whether there is an error in the data. If there is no error in the data, the EEPR
Read the data of OM24 and ROM22 and read D
Write to the PRAMs 20a and 20b.

CPU 10 as a drive stop signal output means
a and 10b, when the operation mode signal and the press speed signal are input, the drive stop signal C / B is output when the drive shaft comes to which rotation position from the slip data of FIG. 2 written in the DPRAMs 20a and 20b. It is determined whether to output to the valves 14 and 15. Then, the CPUs 10a and 10b read the press angle (the rotation angle of the drive shaft) from the rotation angle detection means, and when the rotation angle of the drive shaft detected by the rotation angle detection means reaches the obtained rotation position, the C / B valve 14, A drive stop signal is output to 15. Also, the CPUs 10a and 10b
Plays a role as an emergency stop signal output means, and in the operation routine of the press, the DPRAMs 20a and 20b are
Based on the upper and lower limit values of the ROM 22 written in

[Equation 1] Perform a comparison check of upper limit slip angle> top dead center stop> lower limit slip angle, and if [Equation 1] is not satisfied, C / B
An emergency stop signal for stopping the output of the valves 14 and 15 is output to stop the press in an emergency.

That is, each of the CPUs 10a and 10b has a C
The output position of the drive stop signal output to the / B valves 14 and 15 is between the rotational position lower limit value of the drive shaft obtained from the upper limit slip angle of Fig. 3 and the rotational position upper limit value of the drive shaft obtained from the lower limit slip angle. Determine if you are in. When the drive stop signal is output at a position smaller than the lower limit slip angle, the drive stop signal is output at a position very close to the top dead center of the drive shaft, causing the drive shaft to greatly exceed the top dead center. It is dangerous to run, and conversely, if the drive stop signal is output at a position larger than the upper limit slip angle,
The drive shaft will stop far before top dead center,
Since there is a possibility that the product may be damaged or danger may occur, C
The PUs 10a and 10b constantly check whether [Equation 1] is satisfied, and if not, stop the press urgently.

As described above, in the embodiment, the relationship between the press speed and the slip amount is obtained according to the operation mode, and the drive stop signal is output based on this relationship. Even if different, the drive shaft (slide) can be accurately stopped at the top dead center. Moreover, when the drive stop signal is not output between the lower limit value and the upper limit value, in order to stop the press in an emergency,
It is possible to avoid a large overrun of the slide and improve the safety of the press machine. Moreover, in the embodiment, the slip data is EEP.
Since the data is stored in the ROM 24, the data in the EEPROM 24 can be easily rewritten by the CPU 26, and the data can be easily corrected or added.

In the above embodiment, the case where the double circuit is formed has been described, but the circuit surrounded by the chain double-dashed line in FIG. 1 may be omitted and the circuit may be formed by one circuit. Further, in the above-described embodiment, the case where the slip data corresponding to the operation mode is stored in the EEPROM 24 has been described, but it may be written in the ordinary ROM 22 without using the EEPROM 24.

FIG. 4 is a block diagram according to the second embodiment of the present invention. In FIG. 4, the stop signal output position calculation unit 32 of the control device 30 receives the press speed signal and the mode selection signal and stores the slip angle data as shown in FIG. 2 stored in the slip angle data storage unit 34. Based on the rotation angle of the drive shaft, the drive stop signal should be output, and the obtained output position is determined by the stop signal output unit 36.
Send to. The stop signal output unit 36 reads the press angle signal, and the press angle signal indicates the stop signal output position calculation unit 3
When the stop position is obtained as determined in step 2, the drive stop signal is output to the C / B valve 14, the slip angle correction unit 38, and the emergency stop signal output circuit 42 of the emergency stop signal output unit 40.

The slip angle correction unit 38 obtains the stopped position of the drive shaft from the press speed signal and the press angle signal, and from the time the stop signal output unit 36 outputs the drive stop signal to the stop of the drive shaft. Calculate the slip angle.
Further, the slip angle correction unit 38 compares the slip angle calculated by fetching the mode selection signal with the data in the slip angle data storage unit 34, and if there is a difference between the two, the slip angle data storage unit 34 Rewrite the data to the slip angle data calculated. In addition, without comparing the data obtained by the calculation with the data in the storage unit 34,
The data in the storage unit 34 may always be rewritten with the data obtained by calculation.

The emergency stop signal output section 40 is composed of an emergency stop signal output circuit 42 and an emergency stop signal output position calculation circuit 44. The emergency stop signal output position calculation circuit 44 takes in the press speed to determine the upper and lower limits. From the upper and lower limit data written in the value data storage unit 46 as shown in FIG. 3, the rotational positions of the upper and lower limits of the drive shaft to which the emergency stop signal should be output are obtained and given to the emergency stop signal output circuit 42. . Then, the emergency stop signal output circuit 42 includes the stop signal output unit 36.
Of the drive angle and the press angle signal, it is determined whether the rotational position of the drive shaft to which the stop signal output unit 36 has output the drive stop signal is within the upper and lower limit values determined by the emergency stop signal output position calculation circuit 44, and the drive is performed. When the rotational position of the drive shaft that outputs the stop signal is out of the range of the upper and lower limit positions, an emergency stop signal is output to the C / B valve 14 to stop the valve output and stop the press.

As described above, in the second embodiment, since the slip angle correction unit 38 rewrites the slip angle data corresponding to the operation mode stored in the slip angle data storage unit, the slip angle correction unit 38 rewrites the slip angle data. Even if the control condition such as the friction coefficient of the brake changes due to long-term use, the slide can be accurately stopped at the top dead center, and the safety can be improved. It is needless to say that a double circuit may be configured in this embodiment as well. Incidentally, in the first embodiment, the CPU 10
Determine the actual slip angle from a and 10b, and
After writing to the RAMs 20a and 20b, the CPU 26 may correct the data in the EEPROM 24 based on the data.

[0026]

As described above, according to the present invention, the relationship between the press speed and the output position of the drive stop signal is obtained in advance corresponding to the operation modes such as the one-stroke operation mode and the continuous operation mode. Since the drive stop signal is output when the detected rotation position of the drive shaft reaches the drive stop signal output position that was obtained in advance, the slide can be accurately moved to the top dead center even if the operation mode is different. Can be stopped at a point.

According to the second aspect of the present invention, the actual slip amount is obtained and the slip data stored in the slip angle data storage means is rewritten, whereby the press is continuously operated for a long time. In this case, the slide can be accurately stopped at the top dead center even when various conditions such as changes in the friction coefficient of the brake due to long-term use such as machine temperature and lubrication state change. it can. According to the third aspect of the present invention, even if a case where an abnormality occurs in the control circuit system at the top dead center and the drive stop signal is not output at the predetermined rotational position of the drive shaft, the drive speed may be changed depending on the press speed. Since an emergency stop signal is output based on the upper and lower limit values set in advance, slide overrun can be prevented,
Danger can be prevented.

[Brief description of drawings]

FIG. 1 is a block diagram of a stop control device for a press machine according to a first embodiment of the present invention.

FIG. 2 is a diagram showing an example of slip angle data of a drive shaft with respect to a press speed corresponding to an operation mode according to an embodiment.

FIG. 3 is a diagram showing an example of a lower limit value and an upper limit value of a slip angle according to the embodiment.

FIG. 4 is a block diagram of a stop control device for a press machine according to a second embodiment of the present invention.

[Explanation of symbols]

10a, 10b Drive stop signal output means, emergency stop signal output means (CPU) 14, 15 Drive control section (C / B valve) 22 Upper and lower limit value storage means (ROM) 24 Slip data storage means (EEPRO)
M) 30 control device 34 slip angle data storage unit 36 stop signal output unit 38 slip correction unit (slip angle correction unit) 40 emergency stop signal output unit 46 upper and lower limit value data storage unit

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B30B 15/14 B30B 15/10

Claims (5)

(57) [Claims] 1. A at least slide in response to each operation mode to one stroke, against the press speed, determined the difference between the stop position of the actual driving shaft and the driving stop signal output position in advance
Umate a sliding data storage means for storing a rotation angle detecting means for obtaining a rotation angle of the drive shaft, the rotation speed of the drive shaft
Of the press speed, the mode signal output means for outputting the operation mode of the selected press, and the output signals of the mode signal output means and the press speed detection means are fetched and stored in the slip data storage means. The drive stop signal output position of the press is obtained based on the slip data, and when the drive shaft reaches the obtained drive stop signal output position based on the detection signal of the rotation angle detection means, the press And a drive stop signal output means for outputting a drive stop signal to a drive control unit for controlling the drive of the press machine stop control device. 2. A corresponding at least slide for each operation mode to one stroke, previously obtains the difference between the stop position of the actual driving shaft and the driving stop signal output position against the press speed
A sliding data storage means for storing Te, a rotation angle detecting means for obtaining a rotation angle of the drive shaft, and the press speed detection means for determining the rotational speed <br/> of the drive shaft, the operating mode of the selected press Output Mode signal output means, and output signals of the mode signal output means and the press speed detection means are taken in, and the drive stop signal output position of the press is obtained based on the slip data stored in the slip data storage means. A drive stop signal that outputs a drive stop signal to a drive control unit that controls the drive of the press when the drive shaft reaches the obtained drive stop signal output position based on the detection signal of the rotation angle detection means. Based on the output signals of the output means, the drive stop signal output means, the rotation angle detection means, the press speed detection means, and the mode signal output means, Obtains the actual slip amount of the shaft, the press machine stop control device characterized by having a slip correction means for rewriting the slip amount of newly obtained slip data in the slip data storage means. Wherein at least slide in response to each operation mode to one stroke, previously obtains the difference between the stop position of the actual driving shaft and the driving stop signal output position against the press speed
A sliding data storage means for storing Te, a rotation angle detecting means for obtaining a rotation angle of the drive shaft, and the press speed detection means for determining the rotational speed <br/> of the drive shaft, the operating mode of the selected press Output Mode signal output means, and output signals of the mode signal output means and the press speed detection means are taken in, and the drive stop signal output position of the press is obtained based on the slip data stored in the slip data storage means. A drive stop signal that outputs a drive stop signal to a drive control unit that controls the drive of the press when the drive shaft reaches the obtained drive stop signal output position based on the detection signal of the rotation angle detection means. Based on the output signals of the output means, the drive stop signal output means, the rotation angle detection means, the press speed detection means, and the mode signal output means, A slip correction means for obtaining the actual slip amount of the moving shaft and rewriting the slip data in the slip data storage means to the newly obtained slip amount, and a rotational position predetermined by the press speed and reached by the drive shaft. And a lower limit value at which the drive stop signal output means should not output the drive stop signal, and an upper limit value at which the drive stop signal output means should output the drive stop signal by the rotational position reached by the drive shaft. The drive stop signal output means should not output the drive stop signal from the upper and lower limit value storage means storing the above, and the upper and lower limit values in the upper and lower limit value storage means and the output signal of the press speed detection means. While determining the lower limit value and the upper limit value at which the drive stop signal should be output,
Wherein the rotation angle detecting means and the output signal of the drive stop signal outputting means, when the drive stop signal output means outputs the drive stop signal before the drive shaft reaches the lower limit, or the drive stop signal outputting means, when the drive shaft does not output the drive stop signal by the time it reaches the upper limit value, an emergency stop signal output means for outputting the emergency stop signal to the drive control unit, the A stop control device for a press machine having . 4. The stop device for a press machine according to claim 1, wherein two drive stop signal output means are provided and each of them independently performs the processing in parallel. . 5. The drive stop signal output means and the emergency stop signal output means are provided in twos, respectively, and each of them independently performs the respective processings in parallel. Stop control device for press machines.